Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 577 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 47 × 94 = 4414. Correct or wrong? (a) correct (b) wrong
2. 2.Check with nines: 724 + 944 = 1668. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 23 × 34 = 782. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 51 × 63 = 3219. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 551 + 481 = 1034. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 93 × 42 = 3906. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 295 + 891 = 1191. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 97 × 76 = 7372. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 415 + 422 = 837. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 32 × 45 = 1437. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 864 + 907 = 1771. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 131 + 764 = 888. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 584 + 802 = 1386. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 392 + 542 = 936. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 32 × 63 = 2009. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 99 × 62 = 6138. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 316 + 265 = 588. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 43 × 95 = 4093. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 523 + 503 = 1026. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 56 × 24 = 1343. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 512 + 814 = 1326. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 88 × 72 = 6336. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 158 + 885 = 1046. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 596 + 202 = 798. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 189 + 369 = 552. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 51 × 25 = 1282. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 886 + 706 = 1584. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 12 × 78 = 936. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 807 + 912 = 1719. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 468 + 892 = 1365. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 80 × 27 = 2160. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 80 × 74 = 5920. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 498 + 710 = 1208. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 55 × 38 = 2090. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 717 + 258 = 975. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 80 × 24 = 1920. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 18 × 15 = 265. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 94 × 22 = 2068. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 12 × 76 = 919. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 743 + 134 = 877. Correct or wrong? (a) correct (b) wrong

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